I detected a group of photos both in 3.5.1 as in the latest 3.6.1 version.
Opened them in editor and rotated 90 to look at the nadir. After preview there was some tripod visible. Used markers to get rid of it. Did preview but in 3.6.1 tripod did not go away where in 3.5.1. no problem.
Swithching to ISO cutting solved problem.
Loading 3.6.1. project into 3.5.1 gave same problem. Loading 3.5.1 project into 3.6.1 gave no problem. So it seems to be the new fast fisheye detection that is faulty.